Optical compensation film and display element using the same
US7851068B2 · kind B2 · utility
1Cited by
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23Claims
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Key dates
| Filing date | Sep 22, 2005 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Feb 16, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31855
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an optical compensation film, when a direction that gives the maximum in-plane refractive index is X axis, an in-plane direction perpendicular to X axis is Y axis, a film thickness direction is Z axis, refractive indexes at the wavelength of 590 nm in each axis direction are nX, nY, and nZ respectively, and the film thickness is d, an in-plane retardation value defined as R=(nX−nY)·d and a thickness direction retardation value defined as Rth=|(nX+nY)/2−nZ|·d, both of which are measured under conditions at 23 degrees centigrade and a relative humidity of 50%, satisfy the inequalities of Rth/R≧5 and R≦9.5 (nm).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.